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      fuzzing with peach(Just a toy)
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        <h4 id="0x00-前言"><a href="#0x00-前言" class="headerlink" title="0x00: 前言"></a>0x00: 前言</h4><p>之前学习过peach的使用，在willj师傅的指导下尝试去fuzz了某播放器，只是个尝试，并没有更深入去搞(本来的计划是结合winafl的)，虽然没啥产出，但是fuzz过程还算清晰。过程中实现了自动化的fuzz脚本，有完整的功能，就是效率堪忧-。-</p>
<a id="more"></a>

<h5 id="0x01-关于peach"><a href="#0x01-关于peach" class="headerlink" title="0x01: 关于peach"></a>0x01: 关于peach</h5><p><a href="http://www.peachfuzzer.com/resources/peachcommunity/" target="_blank" rel="noopener">peach</a>是一款优秀的文件格式fuzz工具。<br>peach是基于模板变异工作的，而且开源，文档虽然不是那么多，但是自己多摸索、学习还是可以学会一些基本的用法的。我在看使用peach做文件fuzz相关的资料的时候，最开始看的《0day2》里作者给的例子，从编写pit file到fuzz跑起来；之后看了一份国际友人写的<a href="http://www.flinkd.org/2011/07/fuzzing-with-peach-part-1/" target="_blank" rel="noopener">Fuzzing with Peach – Part 1 « Flinkd!</a>，他这篇文章写的非常好，几乎涵盖了peach 90%的语法，仔细阅读，自己动手实践，会很快入门pit file的编写。</p>
<h5 id="0x02-文件fuzz的思路"><a href="#0x02-文件fuzz的思路" class="headerlink" title="0x02: 文件fuzz的思路"></a>0x02: 文件fuzz的思路</h5><p>fuzz嘛，简单的来看就是</p>
<ul>
<li>构造输入</li>
<li>传给目标程序</li>
<li>程序状态检测(是否crash)</li>
<li>做log</li>
</ul>
<p>之后根据你的log，把有用的样本拿出来在分析。<br>我的想法也很简单，就是利用peach基于我给的一个小文件，生成很多样本，然后写自动化的脚本去fuzz，并且做好异常检测的工作。<br>我的目标是adobe flash player sa版本，刚开始尝试就做一点简单的，选择flv文件作为fuzz的点。下面的问题就是：</p>
<ol>
<li>flv文件格式</li>
<li>根据文件格式编写pit file</li>
<li>如何加载我的fuzz.flv文件？</li>
<li>异常检测怎么做</li>
</ol>
<p>下面慢慢来分析。</p>
<ol>
<li><p>flv文件格式<br><code>flv</code>文件主要分为<code>header</code>和<code>body</code>两个部分。</p>
<ol>
<li>header部分<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">第1-3字节：文件标志，FLV的文件标志为固定的“FLV&quot;，字节（0x46， 0x4C，0x56），见上面的字节序和字符序两行；</span><br><span class="line">第4字节：当前文件版本，固定为1（0x01）</span><br><span class="line">第5字节：此字节当前用到的只有第6，8两个bit位，分别标志当前文件是否存在音频，视频。参见上面bit序，即是第5字节的内容；</span><br><span class="line">第6-9字节：此4字节共同组成一个无符号32位整数（使用大头序），表示文件从FLV Header开始到Flv Body的字节数，当前版本固定为9（0x00，0x00，0x00，0x09）</span><br></pre></td></tr></table></figure></li>
<li>body部分<br>这部分其实就是很多的tag的组合。<br>不过tag的种类有三种，分别是script、Audio、Video。每种tag的tag data又各不相同，详细的可以看一些文档了解。<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">-------------------------</span><br><span class="line">|  Previous Tag Size    |</span><br><span class="line">-------------------------</span><br><span class="line">|          Tag          |</span><br><span class="line">-------------------------</span><br><span class="line">|  Previous Tag Size    |</span><br><span class="line">-------------------------</span><br><span class="line">|          Tag          |</span><br><span class="line">-------------------------</span><br><span class="line">|  Previous Tag Size    |</span><br><span class="line">-------------------------</span><br><span class="line">|          Tag          |</span><br><span class="line">-------------------------</span><br><span class="line">|  Previous Tag Size    |</span><br><span class="line">-------------------------</span><br></pre></td></tr></table></figure>
一些参考的文档<a href="http://blog.useasp.net/archive/2016/02/28/The-flv-video-file-format-specification-version-10-1.aspx" target="_blank" rel="noopener">flv文件格式详解</a>，以及是官方的flv格式相关的文档都可以。</li>
</ol>
</li>
<li><p>根据文件格式编写pit file<br>了解了文件格式之后就是编写pit file了，困难的地方可能就在于tag结构，因为数目不确定，而且相互之间有联系，比如某个bit为1或者0，影响着后面的某个结构的有无。<br>我的做法是，我使用类似Switch case这样的结构，让peach自己去判断选择对应的结构，即我写三种tag，然后限定最大的出现次数，因为样本很小，几百个最多了，然后peach根据模板文件的tag的标志，找到我pit file里对应的tag的结构，然后根据pit file里的结构进行变异，然后生成新的样本。<br>这里可以集合010 editor的二进制模板功能，可以对比你生成的样本是否正确，方便调试。</p>
</li>
<li><p>如何加载我的fuzz.flv文件？<br>有了样本，下面的问题就是怎么加载样本然后播放了。flash并不直接打开flv文件，而是使用swf来加载，所以我需要用as语言来编写一个swf来加载。这时候就有又一个问题：swf要编译的，即我的文件名会写死，这时候就麻烦了。<br>不过这个也好解决，我可以在后续的fuzz脚本中，每次单独复制一个样本到工作目录，然后重命名为swf要加载的文件的名字，然后起flash，加载swf，然后做后续的工作；完成之后，循环这个工作。这样就可以很好的解决这个问题了。</p>
</li>
<li><p>异常检测怎么做<br>我觉得最简单的办法就是调试器了，如果你进程崩了，你的just in time debugger会启动，问你要不要调试，你检测进程就可以了，然后做log，杀了所有进程，继续下一轮fuzz就好了。缺点很明显，这方法贼搓，而且效率低的要死，刚开始搞嘛，凑合用咯。</p>
</li>
</ol>
<h5 id="0x03-编写pit-file"><a href="#0x03-编写pit-file" class="headerlink" title="0x03: 编写pit file"></a>0x03: 编写pit file</h5><p>首先是针对flv header的部分的编写</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">DataModel</span> <span class="attr">name</span>=<span class="string">"flvHeader"</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">String</span> <span class="attr">name</span>=<span class="string">"flv_Signature"</span> <span class="attr">value</span>=<span class="string">"464C5601"</span> <span class="attr">valueType</span>=<span class="string">"hex"</span> <span class="attr">token</span>=<span class="string">"true"</span> <span class="attr">mutable</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    	<span class="tag">&lt;<span class="name">Flags</span> <span class="attr">name</span>=<span class="string">"HeadFlags"</span> <span class="attr">size</span>=<span class="string">"8"</span>&gt;</span></span><br><span class="line">        	<span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"dummy"</span>  <span class="attr">position</span>=<span class="string">"3"</span> <span class="attr">size</span>=<span class="string">"5"</span>/&gt;</span></span><br><span class="line">444<span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"audio"</span>  <span class="attr">position</span>=<span class="string">"2"</span> <span class="attr">size</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"dummy2"</span> <span class="attr">position</span>=<span class="string">"1"</span> <span class="attr">size</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"video"</span>  <span class="attr">position</span>=<span class="string">"0"</span> <span class="attr">size</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">Flags</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"dataoffset"</span> <span class="attr">value</span>=<span class="string">"9"</span> <span class="attr">size</span>=<span class="string">"32"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"zero"</span> <span class="attr">size</span>=<span class="string">"32"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">DataModel</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>这部分是script tag部分的编写</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">Block</span> <span class="attr">name</span>=<span class="string">"script"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"type"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">signed</span>=<span class="string">"false"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">value</span>=<span class="string">"18"</span> <span class="attr">token</span>=<span class="string">"true"</span> <span class="attr">mutable</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"datasize"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"timestamp"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"timestampi"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"streamid"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"firstbyte"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"data2"</span> <span class="attr">lengthType</span>=<span class="string">"calc"</span> <span class="attr">length</span>=<span class="string">"int(self.find('datasize').getInternalValue())-1"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"lastsize"</span> <span class="attr">size</span>=<span class="string">"32"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>这部分是audio tag部分的编写</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">Block</span> <span class="attr">name</span>=<span class="string">"audio"</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"type"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">signed</span>=<span class="string">"false"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">value</span>=<span class="string">"8"</span> <span class="attr">token</span>=<span class="string">"true"</span> <span class="attr">mutable</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"datasize1"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"timestamp"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"timestampi"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"streamid"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">44<span class="tag">&lt;<span class="name">Flags</span> <span class="attr">name</span>=<span class="string">"Flag3"</span> <span class="attr">size</span>=<span class="string">"8"</span>&gt;</span></span><br><span class="line">444<span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"fmt"</span> <span class="attr">position</span>=<span class="string">"0"</span> <span class="attr">size</span>=<span class="string">"4"</span>/&gt;</span></span><br><span class="line">444<span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"sr"</span> <span class="attr">position</span>=<span class="string">"4"</span> <span class="attr">size</span>=<span class="string">"2"</span>/&gt;</span></span><br><span class="line">444<span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"bits"</span> <span class="attr">position</span>=<span class="string">"6"</span> <span class="attr">size</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"channels"</span> <span class="attr">position</span>=<span class="string">"7"</span> <span class="attr">size</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">44<span class="tag">&lt;/<span class="name">Flags</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">Block</span>&gt;</span></span><br><span class="line">        	<span class="tag">&lt;<span class="name">Relation</span> <span class="attr">type</span>=<span class="string">"when"</span> <span class="attr">when</span>=<span class="string">"int(self.find('Flag3.fmt').getInternalValue()) == 10"</span>/&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"frmtype"</span> <span class="attr">length</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"data1"</span> <span class="attr">lengthType</span>=<span class="string">"calc"</span> <span class="attr">length</span>=<span class="string">"int(self.find('datasize1').getInternalValue())-2"</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br><span class="line">44<span class="tag">&lt;<span class="name">Block</span>&gt;</span></span><br><span class="line">        	<span class="tag">&lt;<span class="name">Relation</span> <span class="attr">type</span>=<span class="string">"when"</span> <span class="attr">when</span>=<span class="string">"int(self.find('Flag3.fmt').getInternalValue()) != 10"</span>/&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"data1"</span> <span class="attr">lengthType</span>=<span class="string">"calc"</span> <span class="attr">length</span>=<span class="string">"int(self.find('datasize1').getInternalValue())-1"</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"lastsize"</span> <span class="attr">size</span>=<span class="string">"32"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br></pre></td></tr></table></figure>
<p>这部分是video tag的部分的编写</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">Block</span> <span class="attr">name</span>=<span class="string">"video"</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"type"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">signed</span>=<span class="string">"false"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">value</span>=<span class="string">"9"</span> <span class="attr">token</span>=<span class="string">"true"</span> <span class="attr">mutable</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"datasize2"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"timestamp"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"timestampi"</span> <span class="attr">size</span>=<span class="string">"8"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"streamid"</span> <span class="attr">size</span>=<span class="string">"24"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Flags</span> <span class="attr">name</span>=<span class="string">"Flag2"</span> <span class="attr">size</span>=<span class="string">"8"</span>&gt;</span></span><br><span class="line">    	<span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"frmtype"</span> <span class="attr">position</span>=<span class="string">"0"</span> <span class="attr">size</span>=<span class="string">"4"</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">Flag</span> <span class="attr">name</span>=<span class="string">"codecid"</span> <span class="attr">position</span>=<span class="string">"4"</span> <span class="attr">size</span>=<span class="string">"4"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">Flags</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Block</span>&gt;</span></span><br><span class="line">    	<span class="tag">&lt;<span class="name">Relation</span> <span class="attr">type</span>=<span class="string">"when"</span> <span class="attr">when</span>=<span class="string">"int(self.find('Flag2.codecid').getInternalValue()) == 7"</span>/&gt;</span></span><br><span class="line">44<span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"pkttype"</span> <span class="attr">length</span>=<span class="string">"1"</span>/&gt;</span></span><br><span class="line">44<span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"compotime"</span> <span class="attr">length</span>=<span class="string">"3"</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"data"</span> <span class="attr">lengthType</span>=<span class="string">"calc"</span> <span class="attr">length</span>=<span class="string">"int(self.find('datasize2').getInternalValue())-5"</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Block</span>&gt;</span></span><br><span class="line">    	<span class="tag">&lt;<span class="name">Relation</span> <span class="attr">type</span>=<span class="string">"when"</span> <span class="attr">when</span>=<span class="string">"int(self.find('Flag2.codecid').getInternalValue()) != 7"</span>/&gt;</span></span><br><span class="line">44<span class="tag">&lt;<span class="name">Blob</span> <span class="attr">name</span>=<span class="string">"data"</span> <span class="attr">lengthType</span>=<span class="string">"calc"</span> <span class="attr">length</span>=<span class="string">"int(self.find('datasize2').getInternalValue())-1"</span>/&gt;</span></span><br><span class="line">4<span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br><span class="line">4<span class="tag">&lt;<span class="name">Number</span> <span class="attr">name</span>=<span class="string">"lastsize"</span> <span class="attr">size</span>=<span class="string">"32"</span> <span class="attr">endian</span>=<span class="string">"big"</span> <span class="attr">signed</span>=<span class="string">"false"</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">Block</span>&gt;</span></span><br></pre></td></tr></table></figure>
<h5 id="0x04-swf加载样本"><a href="#0x04-swf加载样本" class="headerlink" title="0x04: swf加载样本"></a>0x04: swf加载样本</h5><p>利用as语言编写的代码，编译后得到swf文件</p>
<figure class="highlight actionscript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">package</span></span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.display.Sprite;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.net.*;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.media.*;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.utils.*;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.display.*</span></span><br><span class="line"><span class="meta">    <span class="meta-keyword">import</span> flash.events.*;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.system.fscommand;</span></span><br><span class="line">    <span class="meta"><span class="meta-keyword">import</span> flash.display3D.textures.VideoTexture;</span></span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Main</span> <span class="keyword">extends</span> <span class="title">Sprite</span></span></span><br><span class="line"><span class="class">    </span>&#123;</span><br><span class="line">        <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">Main</span><span class="params">()</span>:void</span></span><br><span class="line"><span class="function">        </span>&#123;</span><br><span class="line">            <span class="keyword">var</span> video:Video;</span><br><span class="line">            <span class="keyword">var</span> netCon:NetConnection;</span><br><span class="line">            <span class="keyword">var</span> stream:NetStream;</span><br><span class="line"></span><br><span class="line">            <span class="function"><span class="keyword">function</span> <span class="title">loadVideo</span><span class="params">(url:String)</span>:Video</span></span><br><span class="line"><span class="function">            </span>&#123;</span><br><span class="line">                video = <span class="keyword">new</span> Video();</span><br><span class="line">                netCon = <span class="keyword">new</span> NetConnection();</span><br><span class="line">                netCon.connect(<span class="literal">null</span>);</span><br><span class="line">                stream = <span class="keyword">new</span> NetStream(netCon);</span><br><span class="line">                stream.play(url);</span><br><span class="line"></span><br><span class="line">                <span class="keyword">var</span> client:Object = <span class="keyword">new</span> Object();</span><br><span class="line">                client.onMetaData = onMetaEvent;</span><br><span class="line">                stream.client = client;</span><br><span class="line"></span><br><span class="line">                stream.addEventListener(NetStatusEvent.NET_STATUS, netStatus);</span><br><span class="line">                video.attachNetStream(stream);</span><br><span class="line"></span><br><span class="line">                <span class="keyword">return</span> video;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">            <span class="function"><span class="keyword">function</span> <span class="title">onMetaEvent</span><span class="params">(e:Object)</span>:void</span></span><br><span class="line"><span class="function">            </span>&#123;</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="function"><span class="keyword">function</span> <span class="title">netStatus</span><span class="params">(e:NetStatusEvent)</span>:void</span></span><br><span class="line"><span class="function">            </span>&#123;</span><br><span class="line">                video.width  = stage.stageWidth;</span><br><span class="line">                video.height = stage.stageHeight;</span><br><span class="line">            &#125;</span><br><span class="line">            stage.addChild(loadVideo(<span class="string">"fuzz.flv"</span>));</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h5 id="0x05-自动化fuzz脚本"><a href="#0x05-自动化fuzz脚本" class="headerlink" title="0x05: 自动化fuzz脚本"></a>0x05: 自动化fuzz脚本</h5><p>核心部分的代码如下。</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">run</span><span class="params">(fileID)</span>:</span></span><br><span class="line">    copyFile(fileID)</span><br><span class="line">    subprocess.Popen(runCmd)</span><br><span class="line">    <span class="comment">#sleep(2)</span></span><br><span class="line">    checkCrash()</span><br><span class="line">    <span class="comment">#sleep(1)</span></span><br><span class="line">    clean()</span><br></pre></td></tr></table></figure>
<p>首先会拷贝一个样本文件到工作目录</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">copyFile</span><span class="params">(fileID)</span>:</span></span><br><span class="line">    shutil.copyfile(fileDict.get(fileID),workDir+<span class="string">"fuzz.flv"</span>)</span><br></pre></td></tr></table></figure>
<p>然后开始一轮的fuzz</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">fuzzFilename = <span class="string">"fuzz.swf"</span></span><br><span class="line">programName = <span class="string">"flashplayer_22_sa_debug.exe"</span></span><br><span class="line">runCmd = programName +<span class="string">" "</span>+ fuzzFilename</span><br><span class="line">subprocess.Popen(runCmd)</span><br></pre></td></tr></table></figure>
<p>然后是异常检测(贼搓的方法…TAT)</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">checkCrash</span><span class="params">()</span>:</span></span><br><span class="line">    winDbg = <span class="string">"windbg.exe"</span></span><br><span class="line">    <span class="comment">#get process list</span></span><br><span class="line">    <span class="keyword">try</span>:</span><br><span class="line">        processList = psutil.process_iter()</span><br><span class="line">    <span class="keyword">except</span> Exception <span class="keyword">as</span> e:</span><br><span class="line">        <span class="keyword">print</span> e</span><br><span class="line">    <span class="keyword">for</span> p <span class="keyword">in</span> processList:</span><br><span class="line">        <span class="keyword">if</span>(p.name == winDbg):</span><br><span class="line">            <span class="keyword">print</span> <span class="string">"[#]Crash Found! Writing to log now ..."</span></span><br><span class="line">            log(fileID)</span><br><span class="line">            sleep(<span class="number">1</span>)</span><br><span class="line">            p.kill()</span><br><span class="line">        <span class="keyword">else</span>:</span><br><span class="line">            <span class="keyword">pass</span></span><br></pre></td></tr></table></figure>
<p>最后就是收尾的工作了</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">clean</span><span class="params">()</span>:</span></span><br><span class="line">    subprocess.Popen(killProgram)<span class="comment">#kill programName for next one </span></span><br><span class="line">    sleep(<span class="number">1</span>)</span><br><span class="line">    <span class="keyword">if</span>(os.path.exists(workDir+<span class="string">"fuzz.flv"</span>)):</span><br><span class="line">        os.remove(workDir+<span class="string">"fuzz.flv"</span>)</span><br></pre></td></tr></table></figure>

<h5 id="0x06-结束语"><a href="#0x06-结束语" class="headerlink" title="0x06: 结束语"></a>0x06: 结束语</h5><p>我这个东西只能叫toy吧，效率低下，简单粗暴。但是过程中是学习到不少东西，之后的打算是多看一些论文，多学习一些漏洞挖掘的方法，之前尝试了结合winafl来搞，不过问题很多，有待解决…慢慢来吧。<br>所有的东西我都丢github了，有啥错误欢迎各位师傅留言/email指导我 传送门在这里：<a href="https://github.com/o0xmuhe/filefmt_fuzz_with_peach" target="_blank" rel="noopener">fuzz with peach</a></p>
<h5 id="0x07-参考"><a href="#0x07-参考" class="headerlink" title="0x07: 参考"></a>0x07: 参考</h5><p><a href="http://blog.useasp.net/archive/2016/02/28/The-flv-video-file-format-specification-version-10-1.aspx" target="_blank" rel="noopener">flv文件格式详解</a><br><a href="http://www.peachfuzzer.com/resources/peachcommunity/" target="_blank" rel="noopener">peach 文档</a><br><a href="http://www.flinkd.org/2011/07/fuzzing-with-peach-part-1/" target="_blank" rel="noopener">Fuzzing with Peach – Part 1 « Flinkd!</a></p>

      
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        <p><span>本文标题:</span><a href="/2016/12/17/fuzzing-with-peach-Just-a-toy/">fuzzing with peach(Just a toy)</a></p>
        <p><span>文章作者:</span><a href="/" title="访问 muhe 的个人博客">muhe</a></p>
        <p><span>发布时间:</span>2016年12月17日 - 23时38分</p>
        <p><span>最后更新:</span>2016年12月24日 - 01时04分</p>
        <p>
            <span>原始链接:</span><a class="post-url" href="/2016/12/17/fuzzing-with-peach-Just-a-toy/" title="fuzzing with peach(Just a toy)">http://o0xmuhe.me/2016/12/17/fuzzing-with-peach-Just-a-toy/</a>
            <span class="copy-path" data-clipboard-text="原文: http://o0xmuhe.me/2016/12/17/fuzzing-with-peach-Just-a-toy/　　作者: muhe" title="点击复制文章链接"><i class="fa fa-clipboard"></i></span>
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    <ol class="toc"><li class="toc-item toc-level-4"><a class="toc-link" href="#0x00-前言"><span class="toc-number">1.</span> <span class="toc-text">0x00: 前言</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#0x01-关于peach"><span class="toc-number">1.1.</span> <span class="toc-text">0x01: 关于peach</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#0x02-文件fuzz的思路"><span class="toc-number">1.2.</span> <span class="toc-text">0x02: 文件fuzz的思路</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#0x03-编写pit-file"><span class="toc-number">1.3.</span> <span class="toc-text">0x03: 编写pit file</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#0x04-swf加载样本"><span class="toc-number">1.4.</span> <span class="toc-text">0x04: swf加载样本</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#0x05-自动化fuzz脚本"><span class="toc-number">1.5.</span> <span class="toc-text">0x05: 自动化fuzz脚本</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#0x06-结束语"><span class="toc-number">1.6.</span> <span class="toc-text">0x06: 结束语</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#0x07-参考"><span class="toc-number">1.7.</span> <span class="toc-text">0x07: 参考</span></a></li></ol></li></ol>
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